diff options
Diffstat (limited to 'bfd/elf32-i386.c')
| -rw-r--r-- | bfd/elf32-i386.c | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/bfd/elf32-i386.c b/bfd/elf32-i386.c index 05962a07f7..581272fa7c 100644 --- a/bfd/elf32-i386.c +++ b/bfd/elf32-i386.c @@ -29,6 +29,7 @@ #include "bfd_stdint.h" #include "objalloc.h" #include "hashtab.h" +#include "dwarf2.h" /* 386 uses REL relocations instead of RELA. */ #define USE_REL 1 @@ -574,6 +575,45 @@ static const bfd_byte elf_i386_pic_plt_entry[PLT_ENTRY_SIZE] = 0, 0, 0, 0 /* replaced with offset to start of .plt. */ }; +/* .eh_frame covering the .plt section. */ + +static const bfd_byte elf_i386_eh_frame_plt[] = +{ +#define PLT_CIE_LENGTH 20 +#define PLT_FDE_LENGTH 36 +#define PLT_FDE_START_OFFSET 4 + PLT_CIE_LENGTH + 8 +#define PLT_FDE_LEN_OFFSET 4 + PLT_CIE_LENGTH + 12 + PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */ + 0, 0, 0, 0, /* CIE ID */ + 1, /* CIE version */ + 'z', 'R', 0, /* Augmentation string */ + 1, /* Code alignment factor */ + 0x7c, /* Data alignment factor */ + 8, /* Return address column */ + 1, /* Augmentation size */ + DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */ + DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */ + DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */ + DW_CFA_nop, DW_CFA_nop, + + PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */ + PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */ + 0, 0, 0, 0, /* R_386_PC32 .plt goes here */ + 0, 0, 0, 0, /* .plt size goes here */ + 0, /* Augmentation size */ + DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */ + DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */ + DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */ + DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */ + DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */ + 11, /* Block length */ + DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */ + DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */ + DW_OP_lit15, DW_OP_and, DW_OP_lit11, DW_OP_ge, + DW_OP_lit3, DW_OP_shl, DW_OP_plus, + DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop +}; + /* On VxWorks, the .rel.plt.unloaded section has absolute relocations for the PLTResolve stub and then for each PLT entry. */ #define PLTRESOLVE_RELOCS_SHLIB 0 @@ -655,6 +695,7 @@ struct elf_i386_link_hash_table /* Short-cuts to get to dynamic linker sections. */ asection *sdynbss; asection *srelbss; + asection *plt_eh_frame; union { @@ -887,6 +928,25 @@ elf_i386_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info) &htab->srelplt2)) return FALSE; + if (!info->no_ld_generated_unwind_info + && bfd_get_section_by_name (dynobj, ".eh_frame") == NULL + && htab->elf.splt != NULL) + { + flagword flags = get_elf_backend_data (dynobj)->dynamic_sec_flags; + htab->plt_eh_frame + = bfd_make_section_with_flags (dynobj, ".eh_frame", + flags | SEC_READONLY); + if (htab->plt_eh_frame == NULL + || !bfd_set_section_alignment (dynobj, htab->plt_eh_frame, 2)) + return FALSE; + + htab->plt_eh_frame->size = sizeof (elf_i386_eh_frame_plt); + htab->plt_eh_frame->contents + = bfd_alloc (dynobj, htab->plt_eh_frame->size); + memcpy (htab->plt_eh_frame->contents, elf_i386_eh_frame_plt, + sizeof (elf_i386_eh_frame_plt)); + } + return TRUE; } @@ -2667,6 +2727,13 @@ elf_i386_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED, return FALSE; } + if (htab->plt_eh_frame != NULL + && htab->elf.splt != NULL + && htab->elf.splt->size != 0 + && (htab->elf.splt->flags & SEC_EXCLUDE) == 0) + bfd_put_32 (dynobj, htab->elf.splt->size, + htab->plt_eh_frame->contents + PLT_FDE_LEN_OFFSET); + if (htab->elf.dynamic_sections_created) { /* Add some entries to the .dynamic section. We fill in the @@ -4667,6 +4734,33 @@ elf_i386_finish_dynamic_sections (bfd *output_bfd, elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize = 4; } + /* Adjust .eh_frame for .plt section. */ + if (htab->plt_eh_frame != NULL) + { + if (htab->elf.splt != NULL + && htab->elf.splt->size != 0 + && (htab->elf.splt->flags & SEC_EXCLUDE) == 0 + && htab->elf.splt->output_section != NULL + && htab->plt_eh_frame->output_section != NULL) + { + bfd_vma plt_start = htab->elf.splt->output_section->vma; + bfd_vma eh_frame_start = htab->plt_eh_frame->output_section->vma + + htab->plt_eh_frame->output_offset + + PLT_FDE_START_OFFSET; + bfd_put_signed_32 (dynobj, plt_start - eh_frame_start, + htab->plt_eh_frame->contents + + PLT_FDE_START_OFFSET); + } + if (htab->plt_eh_frame->sec_info_type + == ELF_INFO_TYPE_EH_FRAME) + { + if (! _bfd_elf_write_section_eh_frame (output_bfd, info, + htab->plt_eh_frame, + htab->plt_eh_frame->contents)) + return FALSE; + } + } + if (htab->elf.sgot && htab->elf.sgot->size > 0) elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize = 4; @@ -4734,6 +4828,7 @@ elf_i386_add_symbol_hook (bfd * abfd, #define elf_backend_plt_readonly 1 #define elf_backend_want_plt_sym 0 #define elf_backend_got_header_size 12 +#define elf_backend_plt_alignment 4 /* Support RELA for objdump of prelink objects. */ #define elf_info_to_howto elf_i386_info_to_howto_rel |